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TECHNICAL PAPERS

Gas Jet–Workpiece Interactions in Laser Machining

[+] Author and Article Information
Kai Chen, Y. Lawrence Yao, Vijay Modi

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J. Manuf. Sci. Eng 122(3), 429-438 (Nov 01, 1999) (10 pages) doi:10.1115/1.1285901 History: Received September 01, 1998; Revised November 01, 1999
Copyright © 2000 by ASME
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References

Figures

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Schematic of underexanded (a) free jet and (b) impinging jet
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Schematic of computational domain for simulations
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Schematic of experimental setup
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Comparison of computed and measured streamwise pressure variation along a free jet axis for Mj=2.0 and Pj/Pa=1.45
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Comparison of computed and measured streamwise density variation along an impinging jet axis for Mj=1.0,Pj/Pa=3.0 and H/D=2.5
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(a) Measured through-hole mass flow rate with total gauge pressure for d=0.711 mm. (b) Measured through-hole mass flow rate with total gauge pressure for d=0.508 mm.
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(a) Measured through-hole mass flow rate vs. nozzle standoff distance for d=0.711 mm. (b) Measured through-hole mass flow rate vs. nozzle standoff distance for d=0.508 mm.
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Computed and measured through-hole mass flow rate for d=0.711 mm
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Computed and measured through-hole mass flow rate for d=0.711 mm
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(a) Contour of static pressure for Pe=207 kPa (d=0.711 mm, H=2 mm). (b) Contour of static pressure for Pe=276 kPa (d=0.711 mm, H=2 mm).
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Computed variation of total pressure along the centerline for H=2.0 mm and d=0.711 mm
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(a) Contour of static pressure for H=2 mm (d=0.711 mm, Pe=363 KPa). (b) Contour of static pressure for H=3.25 mm (d=0.711 mm, Pe=363 KPa).
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Static pressure gradient inside hole
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Shear force inside hole
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Profilometer measurements of cut surface with different gas pressure at 2.0 mm standoff (incomplete cuts at Pe=323 kPa,Pe=363 kPa)
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Dross attachment on cut surface with different standoff (incomplete cuts for H=2.0 and 2.5 mm)

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